Justin Bieber, Rihanna & more celebs tweet their well-wishes for Sean as he recovers.

We’re happy to report that Sean Kingston “has moved from the trauma unit to ICU,” his rep confirms, following his May 29 jet ski accident in Miami, Fla. The 21-year-old rapper collided with a bridge around 6 p.m., and was critically injured, along with a female passenger. The accident was not alcohol-related, according to officials.

Sean’s speedy recovery certainly wasn’t impeded by the incredible amount of Twitter love sent his way over Memorial Day Weekend.

Justin Bieber, who collaborated with Sean on the hit single “Eenie Meenie” in March 2010,tweeted: “Got my friend @seankingston in my prayers tonight. a true friend and big bro. please keep him in your prayers tonight as well. … he is doing better but out of respect to his family I will wait for them to comment.